Electric-arc lamp



(No Model.)

W. K FREEMAN.

ELECTRIC ARU LAMP. No. 264,269. V Patented Sept. 12, 1882.

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UNITED STATES WALTER K. FREEMAN, OF BROOKLYN, NEW YORK, ASSIGEOR TO W. F

PAT NT OFFICE.

ELECTRIC- ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 264,269, datedSeptember 12, 1882.

Application filed June 15, 1882.

To all whom it may concern:

Be it known that I, WALTER K. FREEMAN, a citizen of the United States,and a resident of Brooklyn, New York, have invented certain Improvementsin Electric-Arc Lamps, of which the following is a specification.

My invention consists of certain improvements in the construction of theregulating devices for the carbons of electric-arc lamps, as more fullydescribed hereinafter.

In the accompanying drawings, Figure 1 is a side view, partly insection, of the upper part of an electric lamp illustrating myinvention; Fig. 2,2. plan view on the line 1 2,1Fig. 1; and Fig. 3, aperspective view of a part of my invention.

A is the upper frame, which carries the regulating devices, and throughwhich passes the movable carbon-holder B. To this frame are also securedthe rods 1) D, insulated therefrom and carrying the lower-carbon holderin the usual manner.

To a lug, a, on one side of the frame A is pivoted the clam p-lever E,carrying at its outer end the two half-cores F F, preferably made in onepiece, and having non-magnetic guiderods f, passing through the frame orthrough the fixed half-cores g g of the two electro-magnets G G. Thecoils of the electro-magnet G are of thick wire, and in the mainworking-circuit, which, presuming that the current enters at thebinding-post (7, passes through the conductor 3, coils of theelectromagnet G, conductor A, frame A, conductor 5,11pper-carbon holder,carbons, lower-carbon holder, rod D, and out at the binding-post d. Thecoils of the electromagnet G are of fine wire in the shuntcircuitbetween the two binding-posts d d. A flatspring,H,pivoteil atoneend,h,to thet'rame, acts at the other end on the lever E to raise it, and isacted on by an adjusting-screw, c, to case the movement of the lever bybalancing the weight of the latter and the parts carried by it. Thelever E carries at its under side the clamp K for the movablecarbon-holderB, which is guided in the frame A, but passes freelythrough enlarged openings in the lever E and spring H, while fittingmore closely in the clamp K, carried by the lever E. This clamp isconnected to the lever by a link, it,

(No model.)

I or similar pivot-joint at one end, and by a bolt and nuts It at theother end, so that the clamp K may be adjusted to the proper angle. Asmall spring, k interposed between the lever and clamp, keeps the latterin its proper position relative to the lever E.

When a current is passed through the main electro-magnet G and themagnetism of the fixed core 9 will act on the core F so as to raise thelever E and with it the clamp K, which raises the carbon-holder i3 andseparates the carbons to form the electric are.

As the consumption of the carbons increases the resistance in the maincircuit the leakage through the coils of the electro-magnet G in theshunt-circuit will cause the axial magnetism and the magnetism of thefixed core g to so act on the core F as to draw down the lever E andcause the clamp K to release the holder B, which is, however,immediately raised again by the consequent increase of the current inthe coils of the electro-magnet G in the main circuit;

I do not desire to claim in this case, broadly, the combination of theregulating clamp and lover with an electro-magnet having lined andmovable cores 5 but I claim as my invention- 1. The combination of themovable carbonholder of an electric-arc lamp, lever E, pivoted to theframe, and clamp K, adjustable on said lever, with cores pivoted to thelever, and electro-maguets in the shunt and main circuits acting on saidcores, substantially as described. 2. The combination of the movablecarbonholder of an electric-arc lamp with. a lever, E, clamp K,connected to the lever at one end by a pivot-joint and at the other bydevices for adjusting its position in relation to said lever, and withelectro-magncts in the shunt and main circuits acting on said lever.

In testimony whereofI have signed my name to this specification in thepresence of two subscribing witnesses.

NAIJTEit K. FREEMAH,

Witnesses:

J onN H. Ks'r'rnusrno'rn, Eonnur EowsoN.

working-circuit the axial magnetism of the

